Flying shear for cutting stock into desired sectional lengths

ABSTRACT

A flying shear, adapted to be installed in the shearing line at the finished end of the heavy plate rolling mill plant for shearing metal plates in various lengths, having a stationary outer housing mounted on the bed plates, a pair of upper knife holder drives which are mounted on the outer housing and drive an eccentric cam shaft journaled on the outer housing for lifting and lowering an upper knife holder, a shiftable inner shear housing moving parallel to the traveling stock and being disposed inside of the outer housing, the inner shear housing guiding the liftable upper knife holder and carrying a lower knife holder to effect a shearing action between the upper knife holder, a pair of shifting supports bearing on the outer housing for supporting the inner shear housing, and a pair of shifting drives mounted on the bed plates for reciprocating the inner shear housing in synchronism with the traveling stock at the time of cutting. The upper knife holder is adapted to reciprocate both elevationally and laterally, and is connected to the eccentric cam shaft for rotating the output shaft of the upper knife holder driving device that is arranged in a stationary manner by a connecting rod. Thus, the desired sectional length of stock is provided by the simple structure of the flying shear.

United States Patent [191 Ito m: 3,811,354 May 21, 1974 Inventor:

Assignee:

Filed:

Appl. No.:

[30] Foreign Application Priority Data Dec. 31, 1970 Japan 45426374 References Cited UNITED STATES PATENTS 3/1940 Grupe 83/32l X l2/l970 Muenchbach 3/l93l Candee 83/320 X Primary Examiner-J. M. Meister [571 ABSTRACT A flying shear, adapted to be installed in the shearing line at the finished end of the heavy plate rolling mill plant for shearing metal plates in various lengths, having a stationary outer housing mounted on the bed plates, a pair of upper knife holder drives which are mounted on the outer housing and drive an eccentric cam shaft joumaled on the outer housing for lifting and lowering an upper knife holder, a shiftable inner shear housing moving parallel to the traveling stock and being disposed inside of the outer housing, thev inner shear housing guiding the liftable upper knife holder and carrying a lower knife holder to effect a shearing action between the upper knife holder, a pair of shifting supports bearing on the outer housing for supporting the inner shear housing, and a pair of shifting drives mounted on the bed plates for reciprocating the inner shear housing in synchronism with the traveling stock at the time of cutting. The upper knife holder is adapted to reciprocate both elevationally and laterally, and is connected to the eccentric cam shaft for rotating the output shaft of the upper knife holder driving device that is arranged in a stationary manner by a connecting rod. Thus, the desired sectional length of stock is provided by the simple structure of the fly- PATENTEDIAm m4 sum 01 or 24 in PRIOR ART FIG.

FIG. 2b

OUOOU/UUUUU 203 CROP CUT PATENTEDIAYZI m4 3; 81 1.354

sum 02 0F 24 FIG. 30 FIG. 3b FIG. 3c

ROTARY DRUMTYPE ROTARY CRANK TYPE PENDLLUM TYPE minimum m4 3L8 1; 354 SHEET as m 2 3 PATENTEB mm mm sum as BE 24 FE E E RELATION BETWEEN x AND X(mm) CUT (J F EL A DE TING Y I200 RELATION BETWEEN AND %f (mm/) q. BACK WARD 0 1 r l 1' 1 45 90 l35 I80 225 270 255 360 LEAVIN TING 0F BLADE FORWARD PAFENFE WAY 2 I914 SHEET 12 [1F 24 MOTOR SPEED Vsp|500 mm/sec I z 0 r f 0 05sec 0.5sec 05sec O Vs=|500- mm/sec 0 $2 9 6 6" ACTUAL SPEED OF MOTOR 48,23 DESIRED VALUE OF Z CONTROLLING SPEED /\CUTTING CORREECTING TIME ACCELERAUON OF DYNAMIC ERROR TIME sec ABOUT 0. 15sec ABOUT 0.5 DL N TIM LOSGC I O 2 sec P'A'I'E'IITEI'JIIIY 2 I IQII 3 81 1; 3 54 SHEET l 0F '24 Vs CUTTING Vs=I500 /sec p 2 q s Vs=|500-1 o s t l.Osec 20sec 30sec y VS-'|50o I BACK- BACKWARD--- FORWARD WARD-- 30sec F i G 2O MOTOR L SPEED T 0 CUTTING FF=I80/SGC l p z q ACCELERATION TIME 'I sec 5 DECELERATION sec 025 025 TIME |.Osec 05sec LOsec l CONTROLLING TIME OF CORRECTING ERROR Pmzmmmel m as 1 1.354

SHEET 15 0F 24 FIG. 22

Lu 0 Z 5 6 *5 E 31 E sHEA F UPP fi QTTO 5 \/375 RAKE 5 BLA HM {5m 2 s 6% A a TOP EDGE OF LOWER SHEAR BLADE MAX PLATE WIDTH 3550mm LENGTH OF SHEAR BLADE 3750mm SHEET 17 0F 24.

PATENTEDIAY 21 1914 mxomkw 45.2. EE 00m UPPER SHEAR BLADE PEED CURVE OF LOWER SHEAR BLADE FIG. 23c

RM /wm/ EN Ap// y m 24W w 8 Wmw L m W... MAm EENE U! w cR r 965% ozFSo mzhmhiw PAIENIEMMHQM $811,354

' sum 18 or 24 FIG.240

ACCELERATIONy DECELERATION 0.25sec I\EAVING 0F UPPER SHEAR cums \iADE 0.25 sec ROTAING SPEED EFFECTIV CUTTING STROKE I32 mm '-I-450mm;TOTAL STROKE PATIENTEIIIIIm IIII 3.81 1.354

SHEET 19 0F 24 FIG 24c LEAVING OF UPPER v CUTTING K IFE BLADE L p vs 2 I g M FIG. 24a

ROTAING SPEED OF R PM ECCENTRIC CAM SHAFT FOR UPPER o s r x SORRM KNIFE HOLDER DRIvE I, P 2 g X, fi/ -l.5 r n /sec fl 3OR.P.M y p z 9 II 0,," r

5 y y Hsec) O 0.5 L0 I.5.2.0 2.5 3.0

-l.0 sec LO sec 05 0 25 LEAVING OF UPPER SHEAR CUTTING BLADE ROTATING SPEED OF INNER- OuT ECCENTRICs FOR SHIFTING D IV LEAVING OF CuTTING UPEER SH R FIG 24d (0.25sec) CONTROLLING TIME OF CORRECTING DYNAMIC ERROR(O.5GGC) ROTATING SPEED (30 r. p m) DECELERATIOM LOsec) ACCELERATION (LOsec) 

1. In a flying shear adapted to be installed in the shearing line at the finished end of the heavy plate rolling mill plant for shearing metal plates in various lengths, having a stationary outer housing mounted on bed plates, a pair of upper knife holder drives mounted on said outer housing and driving an eccentric cam shaft journaled on said outer housing for lifting and lowering an upper knife holder, a shiftable inner shear housing moving parallel to the traveling stock, said inner housing being inside of said outer housing, guiding said liftable upper knife holder and carrying a lower knife holder to effect a shearing action between said upper knife holder, a pair of shifting supports bearing on said outer housing for supporting said inner shear housing, and a pair of shifting drives mounted on said bed plates for reciprocating said inner shear housing in synchronism with the traveling stock at the time of cutting; the improvement wherein an inner eccentric cam is fixed to a drive shaft for oneway rotation, an outer eccentric cam is movably engaged with the outer periphery of said inner eccentric cam and is so mounted as to inversely drive with the same speed as the inner eccentric cam at the same time the connecting rod movably engaged with the outer periphery of said outer eccentric cam, is connected directly or through a rockable lever to the flying shear housing, whereby the composite motion of the inner and outer eccentric cams are converted to the reciprocating motion of the knife holder.
 2. In a flying shear installed in the shearing line at the finished end of the heavy plate rolling mill plant for shearing metal plates in various lengths, having a stationary outer housing mounted on bed plates, a pair of upper knife holder drives mounted on said outer housing and adapted to drive an eccentric cam shaft journaled on said outer housing for lifting and lowering an upper knife holder, a shiftable inner shear housing moving parallel to the traveling stock, said inner housing being inside of said outer housing, guiding said liftable upper knife holder and carrying a lower knife holder to effect a shearing action between said upper knife holder, a pair of shifting supports bearing on said outer housing for supporting said inner shear housing, and a pair of shifting drives mounted on said bed plates for reciprocating said inner shear housing in synchronism with the traveling stock at the time of cutting; the improvement comprising inner and outer eccentric cam shafts and wherein the upper knife holder drives and the inside shearing housing reciprocating drives are driven separately by electric motors, and the upper knife holder drive motor is operated inttermittently and the rotating speed of the eccentric cam shaft for the upper knife edge drive is rotated at a higher speed than the rotating speed of the inner and outer eccentric cam shafts for the inside shearing housing reciprocating flying drive. 